/Engine/Source/Runtime/GeometryCore/Public/Solvers/MatrixInterfaces.h
Generic adapter for building a Sparse Matrix. Generally sparse-matrix assembly code emits matrix entries as tuples of form (i,j,Value).
template<typename RealType> class TSparseMatrixAssembler
TUniqueFunction...
AddEntryFunc
Add matrix entry tuple (i,j,Value)
TUniqueFunction...
ReserveEntriesFunc
Hint to reserve space for at least this many entries